<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // 随便写代码；只要不出现语法错误即可
    console.log(1)
    setTimeout(() => {
      console.log(2)
    }, 100)
    console.log(3)
    new Promise((resolve, reject) => {
      console.log(4)
      resolve(5)
      console.log(6)
    }).then(res => {
      console.log(res) // 5
    })
    setTimeout(() => {
      new Promise((resolve, reject) => {
        console.log(7)
        resolve(8)
      }).then(res => {
        console.log(res) // 8
      })
    }, 100)

    console.log(9)
  </script>
</body>

</html>